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Miscellaneous And Useful Chemical Compounds (Part-VI)

📆 November 4, 2024

Total Questions: 49

1. What is the total charge of an electric dipole? [S.S.C. Online C.H.S.L. (T-I) 11.08.2021 (Shift-I)]

Correct Answer: (c) 0
Solution:An electric dipole is defined as two equal and opposite charges +q and -q, which are located at a fixed distance. These charges have the same magnitude, while the nature is opposite. Therefore, due to the equal and opposite nature of charges on the electric dipole, its total charge is zero.

2. Rain is liquid [S.S.C. Online C.H.S.L. (T-I) 12.08.2021 (Shift-I)]

Correct Answer: (d) condensation
Solution:Rain is liquid condensation. Condensation is the process of conversion of water vapor into liquid. The best example of this is clouds floating in the sky. When water droplets form after the condensation of water vapor in clouds, they become so heavy that they fall towards the ground, i.e., rain.

3. Onions produce the chemical irritant known as syn-propanethial-S-oxide; this stimulates the ____ glands which release tears. [S.S.C. Online C.H.S.L. (T-I) 09.08.2021 (Shift-II)]

Correct Answer: (c) lachrymal
Solution:On cutting an onion, intense burning starts in the eyes. This is due to the syn-Propanethial-S-oxide gaseous compound present in onion juice, which produces sulfenic acid. This gas reacts with the water of the eye and is immediately converted into sulfuric acid, which causes irritation in the eye. This compound is a lachrymatory agent, i.e., it is a lacrimal agent.

4. When we cut an onion, the synthase enzyme converts the amino acid sulfoxides of the onion into which acid? [S.S.C. Online Graduate Level (T-I) 3.03.2020 (Shift-II)]

Correct Answer: (a) Sulfenic acid
Solution:On cutting an onion, intense burning starts in the eyes. This is due to the syn-Propanethial-S-oxide gaseous compound present in onion juice, which produces sulfenic acid. This gas reacts with the water of the eye and is immediately converted into sulfuric acid, which causes irritation in the eye. This compound is a lachrymatory agent, i.e., it is a lacrimal agent.

5. When we cut an onion, the vegetable emits an odour and our eyes tear up. Which of the following compounds is responsible for the tears and odour resulting from freshly cut onions? [S.S.C. Online Graduate Level (T-I) 18.08.2021 (Shift-III)]

Correct Answer: (a) Sulphuric acid
Solution:On cutting an onion, intense burning starts in the eyes. This is due to the syn-Propanethial-S-oxide gaseous compound present in onion juice, which produces sulfenic acid. This gas reacts with the water of the eye and is immediately converted into sulfuric acid, which causes irritation in the eye. This compound is a lachrymatory agent, i.e., it is a lacrimal agent.

6. Phosphorus and nitrogen are examples of which types of impurities in sewage? [S.S.C. Online MTS (T-I) 20.09.2017 (Shift-II)]

Correct Answer: (c) Nutrients
Solution:Nitrogen and phosphorous are essential basic nutrients for plants and animals, which are naturally present in the soil, air, and water. But at present, due to the increase in human activities, more quantity of them has started to be included in sewage water, due to which these elements have taken the form of impurities, while they are nutrients.

7. The mineral Carnotite is an important source of: [S.S.C. Online MTS (T-I) 22.10.2021 (Shift-I)]

Correct Answer: (d) uranium
Solution:Carnotite is a radioactive, bright yellow earthy vanadium mineral that is an important source of uranium (U).

8. Which of the following gases is used in electric bulbs? [S.S.C. Online M.T.S. (T-I) 13.10.2021 (Shift-II)]

Correct Answer: (c) Nitrogen
Solution:A very rarely reactive gas or an inert gas such as argon or nitrogen is filled inside the electric bulb. Due to this, the filament is protected for a longer period even by receiving higher temperatures.

9. When dried raisins are placed in a concentrated salt solution, they ____. [S.S.C. Online M.T.S. (T-I) 11.10.2021 (Shift-I)]

Correct Answer: (a) shrink
Solution:When dried raisins are placed in a concentrated salt solution, they shrink in the solution due to exosmosis.

10. Which chemical reaction takes place during the cooking of meat? [S.S.C. Online C.H.S.L. (T-I) 15.04.2021 (Shift-II)]

Correct Answer: (b) The Maillard reaction
Solution:Maillard reaction is a chemical reaction between an amino acid and a sugar reduction. Protein-rich foods like meat and many other foods undergo this reaction.
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